Temporary header file '/tmp/CgkxlMBeO0/dump1.h' with the following content will be compiled to create GCC translation unit dump:

  // add defines
  #define __STDC_VERSION__ 201710L
#define _TIME_BITS 64
#define _FILE_OFFSET_BITS 64
#define _GXX_NULLPTR_T
#define CLUTTER_ENABLE_COMPOSITOR_API 1
#define _REGEX_NELTS(n)
#define _Atomic
#define PACKED
#define getaddrinfo_a(a,b,c,d)

  // add includes
  #include "/usr/include/prometheus/check_names.h"
  #include "/usr/include/prometheus/client_metric.h"
  #include "/usr/include/prometheus/collectable.h"
  #include "/usr/include/prometheus/counter.h"
  #include "/usr/include/prometheus/detail/builder.h"
  #include "/usr/include/prometheus/detail/ckms_quantiles.h"
  #include "/usr/include/prometheus/detail/core_export.h"
  #include "/usr/include/prometheus/detail/future_std.h"
  #include "/usr/include/prometheus/detail/http_method.h"
  #include "/usr/include/prometheus/detail/pull_export.h"
  #include "/usr/include/prometheus/detail/push_export.h"
  #include "/usr/include/prometheus/detail/time_window_quantiles.h"
  #include "/usr/include/prometheus/detail/utils.h"
  #include "/usr/include/prometheus/exposer.h"
  #include "/usr/include/prometheus/family.h"
  #include "/usr/include/prometheus/gateway.h"
  #include "/usr/include/prometheus/gauge.h"
  #include "/usr/include/prometheus/histogram.h"
  #include "/usr/include/prometheus/labels.h"
  #include "/usr/include/prometheus/metric_family.h"
  #include "/usr/include/prometheus/metric_type.h"
  #include "/usr/include/prometheus/registry.h"
  #include "/usr/include/prometheus/serializer.h"
  #include "/usr/include/prometheus/summary.h"
  #include "/usr/include/prometheus/text_serializer.h"

  // add namespaces
  namespace prometheus{typedef int tmp_add_type_1;}
  prometheus::tmp_add_type_1 tmp_add_func_1(){return 0;};
  namespace prometheus{namespace detail{typedef int tmp_add_type_2;}}
  prometheus::detail::tmp_add_type_2 tmp_add_func_2(){return 0;};

  // add classes
  _G_fpos64_t* tmp_add_class_0;
  _G_fpos_t* tmp_add_class_1;
  _IO_cookie_io_functions_t* tmp_add_class_2;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/CgkxlMBeO0/dump1.h"